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In this note we estimate the sensitivity of the NA64 experiment tomillicharged particles ($\chi$). That experimental facility is dedicated to thesearching for dark sector particles in missing energy events at the CERN SPS.We consider missing momentum signatures in the $\simeq$ 100 GeV electron andmuon beams and show that the later one allows to obtain more stringent boundson the millicharge $Q_{\chi}$, which for the $\chi$ masses $100$~MeV $\leqm_{\chi} \leq 500$~MeV at the level $ Q_{\chi}/e\lesssim O(10^{-3}) -O(10^{-2})$.

Probing millicharged particles with NA64 experiment at CERN